Studies on cementation of copper from sulphate solutions onto zinc metal

Cementation of copper onto zinc metal from sulphate solution has been exami ned through measurement of electrochemical parameters. Both dynamic and ste ady-state polarization plots have been generated for anodic and cathodic ha lf cell reactions and superimposed on one another to obtain the mixed poten tial and the mixed current. Both the processes of copper cementation as wel l as hydrogen reduction have been studied. Kinetic equations have been deve loped for both the processes and mechanistic conclusions have been drawn. C opper cementation has been found to be under diffusion regime, whereas, hyd rogen reduction is controlled by surface elecrochemical reaction.